MNS Low Voltage Switchgear

Stable power distribution is the foundation for the smooth operation of factories and buildings; low-voltage withdrawable switchgear directly determines the safety, operational efficiency, and intelligence level of the entire power network. HUAJIDIAN developed the MNS low voltage switchgear alongside the GCK and MNS series, optimizing designs based on years of industry experience and global customer feedback.

This equipment is compatible with 50/60Hz three-phase AC power systems (rated voltages of 380V/400V/690V) and is used for power transmission and distribution, motor control, and reactive power compensation. Unlike traditional fixed cabinets, the withdrawable drawer structure physically isolates functional units from the main circuit. A faulty unit can be withdrawn for maintenance individually without powering down the entire cabinet, significantly reducing the risk of production line downtime.

Key Product Advantages

1. Standardized and Modular Cabinet Layout

The MNS low voltage switchgear utilizes a unified modular assembly; main and branch busbars are arranged in separate zones, supporting both horizontal and vertical wiring. Drawer circuits and functional modules can be flexibly added or removed based on on-site load requirements without the need for custom cabinet redesigns. This significantly shortens production and delivery times, making it ideal for phased plant expansions and building renovation projects.

2. High IP41 Protection + Isolated, Safe Withdrawable Structure

The cabinet features an IP41 protection rating, blocking solid foreign objects larger than 1mm and preventing dust ingress and accidental contact with live parts. Independent drawers ensure physical isolation between the unit and the main circuit; maintenance involves withdrawing only the faulty drawer, thereby avoiding widespread power outages and enhancing operational safety.

3. Exceptional Short-Circuit Withstand Capability

The main busbar features a maximum rated operating current of 6300A, a short-time withstand current of 100kA/1s, and a peak withstand current of 220kA/0.1s. Branch busbars are available in standard and reinforced versions: the standard type withstands a peak current of 105kA/0.1s, while the reinforced type reaches 176kA/0.1s. In the event of a short-circuit fault, the cabinet structure and busbars resist deformation and prevent arc leakage, ensuring grid stability.

4. Reserved Interfaces for Smart Monitoring Expansion

All MNS low voltage switchgear units come standard with computer communication interfaces, enabling integration with factory automation platforms, intelligent building power distribution systems, and power plant centralized control systems. In highly automated environments—such as petrochemical plants and thermal power stations—these units facilitate remote data acquisition, operational monitoring, and fault early warning, supporting the creation of unmanned, intelligent power distribution networks.

Basic Technical Parameters

INTERIOR STRUCTURE

Applicable Environmental Conditions

1. Ambient temperature: -5°C to +40°C; 24-hour average temperature not exceeding 35°C

2. Installation altitude: ≤2000 meters; for indoor use only

3. Humidity: Relative humidity ≤50% at 40°C; maximum 90% humidity at 20°C; equipped with anti-condensation features to handle temperature fluctuations

4. Installation verticality: Cabinet inclination not exceeding 5°

5. Operating site: Installation in areas containing flammable/explosive media, severe vibration, or corrosive chemical gases is prohibited

Multi-Industry Applications and Real-World Project Cases

Case 1: Power Distribution Project for a Large-Scale Petrochemical Base in East China

A chemical processing facility with an annual output of 1.2 million tons utilizes 28 units of HUAJIDIAN MNS low voltage switchgear. Serving as the workshop's motor control center, the system ensures continuous power supply to reaction vessels and transfer pumps. The IP41-rated cabinets effectively isolate chemical dust, reinforced busbars withstand the surge currents from motor startups, and communication interfaces integrate with the plant's DCS control system; the system has operated stably for three years without any short-circuit incidents.

Case Study 2: Auxiliary Power System for a 300MW Thermal Power Plant

Equipped with 35 units of GCS switchgear to distribute power to auxiliary systems such as water supply, desulfurization, and dust removal units. The 6300A main busbar supports full-load operation, while high short-circuit withstand capability mitigates grid fluctuations during unit start-up and shutdown. Intelligent interfaces connect directly to the plant's central control platform, enabling real-time fault alarms.

HUAJIDIAN: Corporate Strength and Quality Assurance

Established in Wenzhou, Zhejiang in 1998, the brand offers a comprehensive range of power transmission and distribution products, including low-voltage switchgear, ring main units (RMUs), transformers, voltage stabilizers, and circuit breakers.

As a long-term supplier for domestic and international EPC projects, the company holds ISO9001 quality management system certification and CE safety certification. We operate our own standardized factory with a complete quality inspection process, covering raw materials, semi-finished goods, and finished products; every switchgear unit undergoes comprehensive electrical performance testing before leaving the factory.

Our professional technical team provides one-stop services, including power distribution scheme design, on-site installation guidance, and lifelong technical support. Committed to quality first, our products are exported to markets worldwide.

FAQ

Q1: Can HUAJIDIAN MNS low voltage switchgear be expanded later, and what is the maximum number of circuits per unit?

A1: The switchgear features a fully modular design, allowing for the flexible addition or removal of functional drawer units even after on-site installation. There is no need to replace the cabinet frame; simply installing additional drawer modules suffices. Main and branch busbars are equipped with reserved expansion interfaces, significantly reducing the time and cost of system upgrades.

Q2: How should I choose between the standard and reinforced branch busbars for the GCS system?

A2: The standard branch busbar offers a peak withstand rating of 105kA/0.1s, suitable for light-load applications such as office buildings and textile factories. The reinforced version withstands 176kA/0.1s, making it ideal for high-impact short-circuit environments found in petrochemical plants, metallurgical facilities, and large power plants. Our technical team can recommend the appropriate busbar specifications free of charge based on your site's short-circuit current parameters.

Q3: Does the MNS low voltage switchgear support customized intelligent monitoring functions, and which communication protocols are compatible?

A3: All cabinets feature reserved independent communication interfaces and support the installation of customized smart monitoring modules. Compatible with mainstream communication protocols in the power industry, they enable remote data transmission—including voltage, current, cabinet temperature, and fault signals—as well as remote control and anomaly alerts. Solutions for secondary wiring and integration with monitoring systems can also be provided upon request.

Primary circuit technical parameter (as per Dw45)

Note:

1.The current of vertical busbar is extremely up to 2000A@+35℃; (+40℃ with cooler)

2.Protection Degree of lP54 is taken into consideration for special design if needed